package com.boot.component;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * <h3>springboot04-web-crud</h3>
 * <p>拦截器登陆检查</p>
 *
 * @author : 你的名字
 * @date : 2020-03-01 16:38
 **/
public class LoginHandlerInterceptor implements HandlerInterceptor {
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if (user == null) {
            //未登录，返回登录页面
            request.setAttribute("msg", "没有权限请先登录");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        } else {
            //已登录，放行请求
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }
}
